CN109683524B - Processing method for sampling and synchronizing sampling signals without sampling and holding - Google Patents
Processing method for sampling and synchronizing sampling signals without sampling and holding Download PDFInfo
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- CN109683524B CN109683524B CN201811595587.XA CN201811595587A CN109683524B CN 109683524 B CN109683524 B CN 109683524B CN 201811595587 A CN201811595587 A CN 201811595587A CN 109683524 B CN109683524 B CN 109683524B
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
Abstract
The invention relates to a processing method for carrying out sampling synchronization on sampling signals without sampling and holding, which comprises the following steps: step 1: measuring analog quantity acquisition channels in the relay protection device to obtain a time interval delta t between each sampling channel; step 2: calculating data of each sampling point to perform interpolation calculation, and deducing a sampling value before delta t; directly compensating the original sampling points by using a secondary interpolation algorithm, storing the original sampling points into a new array, and compensating the sampling data of each channel to the same moment; and step 3: and performing subsequent protection algorithm calculation by using the compensated new data. The invention provides a processing method for synchronizing the data of each channel of a non-sampling hold circuit, which is used for aligning the sampling time of each channel, provides possibility for the calculation of a point level, does not need to change the original circuit design, and saves the cost and the development period.
Description
Technical Field
The invention relates to the technical field of relay protection, in particular to a method for carrying out sampling signal synchronization processing on sampling signals without sampling and holding.
Background
An analog quantity acquisition board in the relay protection device does not perform sampling and holding processing on acquisition signals of all channels at the beginning of design, but sequentially samples data of all channels. However, in the subsequent device upgrading process, sampling data of all paths at the same time is needed, and when a hardware sampling circuit is not allowed due to the limitation of cost and development period, interpolation processing needs to be carried out on the original sampling data, so that a group of sampling data at the same time can be simulated.
Therefore, the problems of development cost and period are solved, and the down compatibility of the produced equipment can be realized.
Disclosure of Invention
The invention aims to provide a software processing method for synchronizing signals of all paths on a non-sampling hold circuit. The invention provides a processing method for synchronizing the data of each channel of a non-sampling hold circuit, which is used for aligning the sampling time of each channel, provides possibility for the calculation of a point level, does not need to change the original circuit design, and saves the cost and the development period.
In order to achieve the purpose, the invention adopts the following technical means:
a processing method for carrying out sampling synchronization on sampling signals without sampling and holding comprises the following steps:
step 1: measuring analog quantity acquisition channels in the relay protection device to obtain a time interval delta t between each sampling channel;
step 2: performing interpolation calculation on each sampling point data, and deducing a sampling value before a time interval delta t; directly compensating the original sampling points by using a secondary interpolation algorithm, storing the original sampling points into a new array, and compensating the sampling data of each channel to the same moment;
and step 3: and performing subsequent protection algorithm calculation by using the compensated new data.
As a further improvement of the present invention, in step 2,
the quadratic interpolation formula is:
wherein:
x (k-2), x (k-1), x (k) are three consecutive sampling points; y (n) is the interpolated sample point; t (k) and t (k-1) correspond to the sampling time of x (k), x (k-1), tyAnd p is the calculated compensation coefficient.
As a further improvement of the present invention, when the sampling point needs to be moved for a fixed time, the following process is applied to equation (2):
wherein, tdraftFor the time the sample point needs to be moved, for the second path t in turndraftIs delta t microsecond, the second channel is 2 delta t microsecond, and so on.
Compared with the prior art, the invention has the following technical effects:
according to the invention, the delta t required to be compensated is calculated, a quadratic interpolation algorithm is used, the original sampling point is directly compensated, and the original sampling point is stored in a new array, so that the sampling data of each channel is compensated to the same moment. For a hardware acquisition circuit without sampling and holding, the acquired data can basically meet the requirement of sampling data synchronization after an interpolation algorithm. The method does not need to change the circuit of the hardware analog quantity acquisition board, can directly use the analog quantity acquisition board which is put into production, saves the cost, shortens the research and development period and has good compatibility.
Drawings
FIG. 1 is a flow chart embodying the present invention;
FIG. 2 is a first diagram of the simulation effect of the algorithm of the present invention;
FIG. 3 is a diagram of the simulation effect of the algorithm of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, algorithms required to be used in the description of the embodiments will be briefly described below, and it is obvious that the algorithms in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other algorithms based on these algorithms without creative efforts.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following further description is made of specific embodiments of the present invention, which are intended to be illustrative rather than restrictive.
The core idea of the invention is as follows: and calculating delta t required to be compensated according to the sampling time interval between the hardware channels, directly compensating the original sampling points by using a quadratic interpolation algorithm, and storing the original sampling points into a new array so as to compensate the sampling data of each channel to the same moment. And performing subsequent protection calculation by using the compensated data.
On the premise of not changing the original hardware link, measuring the sampling time difference delta t between each channel, and supplementing the time difference delta t of sampling points between each channel introduced by hardware asynchronous sampling through a software algorithm. The flow is shown in FIG. 1.
Step 1: sampling data;
step 2: calculating data of each sampling point to perform interpolation calculation, and deducing a sampling value before delta t;
and step 3: and performing subsequent protection algorithm calculation by using the compensated new data.
The invention relates to a processing method for synchronizing data of each channel of a non-sampling hold circuit, which is used for aligning sampling time of each channel, provides possibility for calculating point level without changing the original circuit design, saves cost and development period, and comprises the following specific steps:
the method comprises the following steps: and measuring analog quantity acquisition channels in the relay protection device to obtain the time interval delta t between the sampling channels.
Step two: in the program, the original sampling points are compensated according to a quadratic interpolation formula (1).
Wherein:
x (k-2), x (k-1), x (k) are three consecutive sampling points; y (n) is the interpolated sample point; t (k) and t (k-1) correspond to the sampling time of x (k), x (k-1), tyAnd p is the calculated compensation coefficient.
When the sampling point needs to be moved for a fixed time, the following process can be applied to equation (2):
wherein t isdraftFor the time the sample point needs to be moved, for the second path t in turndraftIs delta t microsecond, the second channel is 2 delta t microsecond, and so on。
And step three, the new sampling array obtained after calculation is used for subsequent protection calculation, so that protection algorithms such as zero sequence removal, charging current calculation and the like can be carried out on the point level.
As shown in FIG. 2 and FIG. 3, the simulation effect graphs of the algorithm of the present invention show that the sampling points after interpolation calculation are substantially the same as the original sampling points without phase shift processing, and the compensation effect is good.
The practical test results of the invention are as follows:
the same analog quantity acquisition board (without sampling and holding) is used in the test, three phases are added with the current 2A with the same amplitude, the voltage 69V with the same amplitude, and the theoretical phase difference of the current and voltage phase angle is 90 degrees:
a. the fundamental values calculated without interpolation are shown in table 1:
TABLE 1
| Electric current | IA | IB | IC |
| Amplitude (mA) | 2003 | 2001 | 2003 |
| Angle (°) | 285.677 | 386.202 | 268.625 |
| Voltage of | VA | VB | VC |
| Amplitude (mV) | 69005 | 69136 | 69080 |
| Angle (°) | 17.120 | 17.567 | 17.744 |
From the table, it can be seen that the IA differs from the other channel angles in table 2:
TABLE 2
| IA | And IB | And IC | And VA | And VB | And VC |
| By an angle (°) different from IA | 0.525 | 0.948 | 91.443 | 91.89 | 92.067 |
b. The fundamental values calculated using the interpolation algorithm are shown in table 3:
TABLE 3
From the table, it can be seen that the IA differs from the other channel angles by table 4:
TABLE 4
| IA | And IB | And IC | And VA | And VB | And VC |
| By an angle (°) different from IA | 0.180 | 0.244 | 89.868 | 89.901 | 90.009 |
It can be seen from tables 1 to 4 that, under the same test environment, the phase angle difference of each channel using the interpolation algorithm is effectively compensated, so that under the condition of not changing the hardware circuit of the acquisition board, the correction of the acquisition time difference of each channel is realized, and the corrected sampling point can be applied to zero sequence elimination, subsequent amplitude calculation and the like of the sampling point layer.
The foregoing is a detailed description of the present invention with reference to specific preferred embodiments, and no attempt is made to limit the invention to the particular embodiments disclosed, or modifications and equivalents thereof, since those skilled in the art may make various alterations and equivalents without departing from the spirit and scope of the invention, which is defined by the claims appended hereto.
Claims (1)
1. A processing method for sampling and synchronizing sampling signals without sampling and holding is characterized by comprising the following steps:
step 1: measuring analog quantity acquisition channels in the relay protection device to obtain a time interval delta t between each sampling channel;
step 2: performing interpolation calculation on each sampling point data, and deducing a sampling value before a time interval delta t; directly compensating the original sampling points by using a secondary interpolation algorithm, storing the original sampling points into a new array, and compensating the sampling data of each channel to the same moment;
and step 3: performing zero sequence removal and charging current calculation on a point level by using the compensated new data;
in step 2, the quadratic interpolation formula is:
wherein:
x (k-2), x (k-1), x (k) are three consecutive sampling points; y (n) is the interpolated sample point; t (k) and t (k-1) correspond to the sampling time of x (k), x (k-1), tyThe time of the interpolation target point is, and p is a compensation coefficient obtained by calculation;
when the sampling point needs to be moved for a fixed time, the following process is applied to equation (2):
wherein, tdraftFor the time the sample point needs to be moved, for the second path t in turndraftIs delta t microsecond, the second channel is 2 delta t microsecond, and so on.
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